Castletownshend (Irish: Baile an Chaisleáin, literally "town of the castle")[2] is a village about 8 km (5 mi) south-east of Skibbereen, in County Cork, Ireland.

The village developed around a small 17th-century castle built by Richard Townsend, whose descendants still reside there.

The main street of the town, lined with large homes from the 18th century, runs down a sharply sloped hill leading to Castlehaven Harbour and the castle.

[1] Castletownsend was the home of Edith Anna Œnone Somerville, one half of the writing duo Somerville and Ross, who together authored the Irish RM series of humorous novels on Irish life in the early 1900s.

[citation needed] Sir Patrick Buckley (1841–1896) was born near the village in the townland of Gortbrack.